April 9, 2007Diesel's not just for truckers anymore. Converting cars with notoriously bad mileage can make them eco-friendly without compromising performance.Photos: Muscle cars with a conscienceVideo: Souped-up Impala outraces LamborghiniTAGS:biodiesel, Hummer, Lamborghini, car, horsepower, natural gas, engine, alternative energy, mile, video